Android的自定义视图大小 [英] Android Custom View Size

问题描述

我试图创造的android我自己的看法这简直是一个椭圆形的，将根据典型的机器人绘制正确：layout_width 和的android：layout_height 参数。

I am attempting to create my own view in android which is simply an oval and will be drawn correctly based on the typical android:layout_width and android:layout_height parameters.

因此​​，举例来说，如果在我的XML布局文件，我有一个的LinearLayout这是最高级别的View容器，然后，我希望能够加入我自己的意见椭圆形多。 （我称之为PieFiller）

So for example, if in my XML layout file, I have a LinearLayout which is the highest level View Container, I then want to be able to add multiple of my own oval Views. (which I called "PieFiller")

我知道我非常接近，但由于某些原因，我不知道如何确定如果XML文件中的用户说，FILL_PARENT或WRAP_CONTENT我不知道我是否应该甚至可以要求该信息。让我们假设WRAP_CONTENT只会画一个圆是40×40像素。但是，如果XML布局文件指定宽度应FILL_PARENT，高度WRAP_CONTENT我要很长的横椭圆即40像素高，在屏幕的像素数。

I know I am very close, but for some reason, I do not know how to determine if the user in the XML file said "fill_parent" or "wrap_content" and I don't know if I should even be asking for that information. Lets assume that wrap_content would simply draw a circle that is 40x40 pixels. But, if the XML layout file specifies that the width should "fill_parent" and the height "wrap_content" I want a long horizontal oval that is 40 pixels high and the number of pixels of the screen across.

下面是我的布局XML文件中的code和我的自定义视图：

Below is the code from my layout xml file and my custom view:

布局文件

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:custom="http://schemas.android.com/apk/res/com.example.relativelayoutexample"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <com.example.relativelayoutexample.PieFiller
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        custom:labelPosition="left"
        custom:showText="true" />

    <com.example.relativelayoutexample.PieFiller
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        custom:labelPosition="left"
        custom:showText="true" />

</LinearLayout>

称为PieFiller自定义视图类

package com.example.relativelayoutexample;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.view.View;

public class PieFiller extends View
{
    private boolean mShowText;
    private int mTextPos;

    private Paint paint;

    private RectF mBounds;

    public PieFiller(Context context, AttributeSet attrs)
    {
        super(context, attrs);


        TypedArray a = context.getTheme().obtainStyledAttributes(attrs, R.styleable.PieFiller,0,0);

        try
        {
            mShowText = a.getBoolean(R.styleable.PieFiller_showText, false);
            mTextPos = a.getInteger(R.styleable.PieFiller_labelPosition, 0);
        }
        finally
        {
            a.recycle();
        }


        paint = new Paint(Paint.ANTI_ALIAS_FLAG);
        paint.setColor(Color.BLUE);
        paint.setStyle(Paint.Style.FILL);
        mBounds = new RectF();
    }

    public void onDraw(Canvas canvas)
    {
        canvas.drawCircle(40.0f, 40.0f, 40.0f, paint);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
    {
        int minw = getSuggestedMinimumWidth();
        int w = Math.max(minw,MeasureSpec.getSize(widthMeasureSpec));

        int minh = this.getSuggestedMinimumHeight();
        int h = Math.max(minh, MeasureSpec.getSize(heightMeasureSpec));

        setMeasuredDimension(w,h);
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh)
    {
        mBounds = new RectF(0,0,w,h);
    }

    public boolean ismShowText()
    {
        return mShowText;
    }
    public void setmShowText(boolean mShowText)
    {
        this.mShowText = mShowText;
        this.invalidate();
        this.requestLayout();
    }
    public int getmTextPos()
    {
        return mTextPos;
    }
    public void setmTextPos(int mTextPos)
    {
        this.mTextPos = mTextPos;
        this.invalidate();
        this.requestLayout();
    }



}

顺便说一下，在code的结果上面贴，第一PieFiller占据整个屏幕。 （我不希望它）

By the way, the result of the code posted above, the first PieFiller takes up the entire screen. (which I don't want it to)

推荐答案

在onMeasure（）自定义视图中添加以下的逻辑：

Inside onMeasure() of your custom view add below logic:

int width = 100;
    if(getLayoutParams().width==LayoutParams.WRAP_CONTENT)
    {
        width = 40;
    }
    else if((getLayoutParams().width==LayoutParams.MATCH_PARENT)||(getLayoutParams().width==LayoutParams.FILL_PARENT))
    {
        width = MeasureSpec.getSize(widthMeasureSpec);
    }
    else
        width = getLayoutParams().width;


    int height = 100;
    if(getLayoutParams().height==LayoutParams.WRAP_CONTENT)
    {

    }
    else if((getLayoutParams().height==LayoutParams.MATCH_PARENT)||(getLayoutParams().height==LayoutParams.FILL_PARENT))
    {
        height = MeasureSpec.getSize(heightMeasureSpec);
    }
    else
        height = getLayoutParams().height;


    setMeasuredDimension(width|MeasureSpec.EXACTLY, height|MeasureSpec.EXACTLY);

这篇关于Android的自定义视图大小的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！